Added type hinting and improve assertions in tests

Author: mikadamczyk

src/lib/Search/Common/FieldValueMapper/EmbeddingMapper.php

@@ -22,6 +22,9 @@ public function canMap(Field $field): bool
         return $field->getType() instanceof EmbeddingField;
     }
 
+    /**
+     * @return mixed
+     */
     public function map(Field $field)
     {
         return $field->getValue();

tests/integration/Core/Search/FieldType/EmbeddingFieldFactoryTest.php

@@ -38,7 +38,7 @@ public function testCreateWithCustomType(): void
     {
         $config = $this->createMock(EmbeddingConfigurationInterface::class);
         $config
-            ->expects($this->never())
+            ->expects(self::never())
             ->method('getDefaultModelFieldSuffix');
 
         $factory = new EmbeddingFieldFactory($config);

tests/lib/Search/Embedding/EmbeddingProviderRegistryTest.php

@@ -60,7 +60,7 @@ public function testGetEmbeddingProviders(): void
 
         $embeddingProviders = $registry->getEmbeddingProviders();
 
-        $this->assertIsArray(
+        self::assertIsArray(
             $embeddingProviders,
             'getProviders() should return an array of embedding providers'
         );